I know I did something in the last couple of days that is the cause of this. I, idiotically, went through and renamed and deleted a bunch of files in the directory of my library which I have since found out is a terrible thing to do.
So at various points I did a Restore Database and used Time Machine to go back a few days neither of which left me with my complete library. I thought "gee let's just start from scratch!" and I created a new library and went one by one and added books from anywhere and everywhere they were stored on my laptop then I went through and cleaned up all the metadata...and now I have some .epubs that simply will not load back to calibre and give me error messages (as I posted above). I can open them with my Nook for Mac app just fine though.
I'm kicking myself for meddling with the original files. At this point what would you say the best thing to do is?
Thanks to anyone who has any advice!
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